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Stockholders equity and dividend payment, Dividend payment (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 02, 2020
May 26, 2020
Feb. 25, 2020
Nov. 14, 2019
Aug. 29, 2019
May 28, 2019
Feb. 26, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dividend Payment [Abstract]                    
Total payment $ 82,000 $ 51,500 $ 47,000 $ 7,300 $ 2,800 $ 11,400 $ 7,100 $ 180,509 $ 21,345 $ 28,700
Per share Common (in dollars per share) $ 0.48 $ 0.35 $ 0.32 $ 0.05 $ 0.02 $ 0.08 $ 0.05 $ 1.15   $ 0.20